...
A simple solution would be to map each DataStage Project to a Path that is the same name as the Project. Give due consideration to the many negative implications of having multiple DataStage projects sharing a single Git repository before adopting this approach. We won't catalogue all those implications here as we’d prefer that you just don’t do it. 
One Project, Many Repositories
...
MettleCI does not permit you to map a single DataStage Project to multiple Git repositories. Some customers have multiple DataStage solutions co-resident in a single DataStage Project. In these cases customers should split their work into separate Projects representing their distinct solutions before establishing the Git Project for each.
...